4. Amy takes a trip from Chicago to Milwaukee. Due to road construction, she drives the first 10 miles at a constant speed of 20 mph. For the next 30 miles she maintains a constant speed of 60 mph and then stops at McDonald's for 10 minutes for a snack. She drives the next 45 miles at a constant speed of 45 mph. (a) Draw a graph which shows Amy's distance along the road from her starting point as a function of time. (b) Draw a graph which shows her velocity as a function of time. (c) What is her average speed for the trip (including the stop at McDonald's)?
Added by Devin S.
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For the first 10 miles at 20 mph: time = distance / speed = 10 miles / 20 mph = 0.5 hours For the next 30 miles at 60 mph: time = distance / speed = 30 miles / 60 mph = 0.5 hours For the 10-minute stop at McDonald's: time = 10 minutes = 1/6 hour For the last Show more…
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